<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
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<body>
  
  <script>
    const  makeAdder=(b)=>{
      const fn=(a)=>a+b
      return fn
    }

    const addFive = makeAdder(5);
    console.log(addFive(10));
    console.log(addFive(20));
  </script>
</body>
</html>